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Temperature Field Measurements Using Thin Filament Pyrometry in a Medium- Scale Methanol Pool Fire

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Temperature Field Measurements Using Thin Filament Pyrometry in a Medium- Scale Methanol Pool Fire NIST Technical Note 2031 Temperature Field Measurements using Thin Filament Pyrometry in a Medium- Scale Methanol Pool Fire Zhigang Wang Wai Cheong Tam Ki Yong Lee Anthony Hamins This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.2031 NIST Technical Note 2031 Temperature Field Measurements using Thin Filament Pyrometry in a Medium- Scale Methanol Pool Fire Zhigang Wang* Wai Cheong Tam Ki Yong Lee** Anthony Hamins Fire Research Division Engineering Laboratory permanent addresses: * University of Science and Technology of China, Hefei, China ** Andong National University, Andong, Republic of Korea This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.2031 November 2018 U.S. Department of Commerce Wilbur L. Ross, Jr., Secretary National Institute of Standards and Technology Walter Copan, NIST Director and Under Secretary of Commerce for Standards and Technology Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for the purpose. National Institute of Standards and Technology Technical Note 2031 Natl. Inst. Stand. Technol. Tech. Note 2031, 24 pages (November 2018) CODEN: NTNOEF This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.2031 Table of Contents 1. Background ............................................................................................................................................................ 1 2. Experimental Method ............................................................................................................................................ 2 2.1 Exhaust Hood and Compartment ......................................................................................................................... 3 2.2 Pool Burner .......................................................................................................................................................... 3 2.3 SiC Filaments ..................................................................................................................................................... 4 2.4 Thermocouple Temperature Measurement .......................................................................................................... 5 This publication is available free of charge from: https://doi.org/10.6028/NIST.TN 2.4.1 Pyrometry Calibration Strategy .................................................................................................................... 5 2.4.2 Thermocouple Radiation Correction ............................................................................................................. 5 This publication is available free of charge from: https://doi.org/10.6028/NIST.TN. 2.5 Camera ................................................................................................................................................................ 6 3. Results and Discussion ............................................................................................................................................. 6 3.1 Thermocouple Temperature and Filament Intensity ............................................................................................ 6 3.2 Estimate of the Temperature Field ..................................................................................................................... 11 3.3 Changing Temperature Field ............................................................................................................................ 14 4. Summary and Conclusions ...................................................................................................................................... 17 5. Acknowledgements ................................................................................................................................................. 17 6. References .............................................................................................................................................................. 18 .2031 2031 i Temperature Field Measurements using Thin Filament Pyrometry in a Medium-Scale Methanol Pool Fire ABSTRACT Measurements were made to characterize the time-varying temperature field in a medium-sized methyl alcohol (methanol; CH3OH) pool fire steadily burning in a quiescent environment. A digital camera fitted with optical filters and a zoom lens was used to record the high temperature emission intensity of 14 µm diameter Type S Silicon-Carbide filaments oriented horizontally at various heights above a This publication is available free of charge from: https://doi.org/10.6028/NIST.TN central cross-section of a steadily burning 0.30 m diameter methanol pool fire. The camera optics focused on the filaments with a field of view of approximately 0.3 m wide by 0.6 m high. Using the optical camera, the filament This publication is available free of charge from: https://doi.org/10.6028/NIST.TN. was observable only for temperatures larger than 1150 K. Experiments were conducted to collect thousands of frames of 30 Hz video. In a separate experiment, a 50 µm diameter thermocouple was used to acquire 3400 independent temperature measurements at several locations in the high temperature zone of the fire. A correlation was developed between the probability density functions of the radiation-corrected thermocouple measurements and the camera grayscale pixel intensity of the filament for the same fire locations. Assuming a Gaussian temperature distribution, a fitting routine was used to determine the mean temperature and its variance from the calculated filament temperature. The mean temperatures compared favorably to previously reported measurements. False color maps of temperature were produced characterizing the entire high temperature flow field as a function of time. The time-averaged temperature field for each phase of the pulsing methanol fire was also determined. The results provide insight into the dynamic character of turbulent pool fires. .2031 2031 KEYWORDS: methanol; pool fires, pyrometry; temperature field measurements. ii 1. BACKGROUND The focus of this study was the development of a new data set characterizing the time-varying temperature field in a medium-scale pool fire steadily-burning in a well-ventilated, quiescent environment. Pool fires are a fundamental type of combustion phenomena in which the fuel surface is isothermal, flat, and horizontal, which provides a simple and well-defined configuration for testing models and furthering the understanding of fire phenomena. The fires are characterized by a dominant puffing frequency associated with the large-scale vortical structures generated by the fire [1]. In this study, methyl alcohol (methanol; CH3OH) was selected as the fuel for investigation This publication is since it yields a fire in which no carbonaceous soot is present. Use of fire modeling in fire protection engineering has dramatically increased during the last decade This publication is available free of charge from: https://doi.org/10.6028/NIST.TN. due to the development of practical computational fluid dynamic fire models and the decreased cost of computational power. Today, fire protection engineers use models like the Consolidated Fire and Smoke Transport Model (CFAST) and the Fire Dynamics Simulator (FDS) to design safer buildings, available free of charge from: https://doi.org/10.6028/NIST.TN. nuclear power plants, aircraft cabins, trains, and marine vessels to name a few types of applications [2, 3]. To be reliable, the models require validation, which involves a large collection of experimental measurements. Traditionally, model validation studies in fire research are typically conducted through comparison of model results with time-averaged and root mean square (rms) measurements of quantities such as temperature and heat flux. The objective of this study is to provide a data set of time-varying field measurements from a medium-scale pool fire. Bryant [4] reported on the measured velocity field in a compartment doorway using stereoscopic particle imaging velocimetry. A method based on thin filament pyrometry has been previously used to analyze temperature behavior in time varying, non-premixed flames. Hariharan et al. measured the structure of a blue fire whirl burning heptane and other hydrocarbons using fine wire thermocouples and thin-filament pyrometry [5, 6]. Pitts used thin filament pyrometry to characterize the structure of acoustically phase-locked flickering methane-air diffusion flames [7]. Most fire studies typically report time-averaged measurements – even if many simultaneous local measurements were conducted (e.g., Ref. [8]). Furthermore, studies in the fire literature commonly use large diameter thermocouples (> 500 µm), which have relatively large time constants (> 1 s), which results in instrument response times that are not particularly useful for understanding the time-resolved structure of time varying fires. 2031 Fires burning methanol are particularly unusual since no carbonaceous soot is present. The absence of soot creates conditions advantageous for application of thin filament pyrometry methods as there is no 2031 background blackbody radiation source, which
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